GREE

Applicable Models:

• GWHD(14)NK600
• GWHD(18)NK600
• GWHD(21)NK600
• GWHD(24)NK600
• GWHD(28)NK600
• GWHD(36)NK600
• GWHD(42)NK600

General Information

In line with the company's policy of continual product improvement, the aesthetic and dimensional characteristics, technical data and accessories of this appliance may be changed without notice.

Contents

The products in this manual may differ from the actual unit depending on the model. Some models may have a display, while others may not. Refer to the actual unit for the position and shape of the display.

This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.

If installation, moving, or maintenance of the air conditioner is required, please contact a dealer or local service center first. Air conditioner installation, moving, or maintenance must be performed by an appointed unit. Failure to do so may cause serious damage or personal injury or death. When refrigerant leaks or requires discharge during installation, maintenance, or disassembly, it should be handled by certified professionals or otherwise in compliance with local laws and regulations.

Environmental Protection: This marking ♻️ (crossed-out wheeled bin) indicates that this product should not be disposed of with other household wastes throughout the EU. To prevent possible harm to the environment or human health from uncontrolled waste disposal, recycle it responsibly to promote the sustainable reuse of material resources. To return your used device, please use the return and collection systems or contact the retailer where the product was purchased. They can take this product for environmental safe recycling.

Refrigerant Type: R32

Explanation of Symbols

Exception Clauses

Manufacturer will bear no responsibilities when personal injury or property loss is caused by the following reasons:

1. Damage the product due to improper use or misuse of the product.
2. Alter, change, maintain or use the product with other equipment without abiding by the instruction manual of manufacturer.
3. After verification, the defect of product is directly caused by corrosive gas.
4. After verification, the defects are due to improper operation during transportation of product.
5. Operate, repair, maintain the unit without abiding by instruction manual or related regulations.
6. After verification, the problem or dispute is caused by the quality specification or performance of parts and components that produced by other manufacturers.
7. The damage is caused by natural calamities, bad using environment or force majeure.

Conformity and Range

Please read this owner's manual carefully before operating the unit and keep it carefully for consultation.

Only use the air conditioner as instructed in this booklet. These instructions are not intended to cover every possible condition and situation. As with any electrical household appliance, common sense and caution are therefore always recommended for installation, operation and maintenance.

The Refrigerant

Please read this operating manual carefully before operating the unit.

✔️ Appliance filled with flammable gas R32.

i Before use the appliance, read the owner's manual first.

i Before install the appliance, read the installation manual first.

i Before repair the appliance, read the service manual first.

The figures in this manual may be different from the actual unit, please refer to the actual unit for reference.

To realize the function of the air conditioner unit, a special refrigerant circulates in the system. The used refrigerant is the fluoride R32, which is specially cleaned. The refrigerant is flammable and inodorous. Furthermore, it can lead to explosion under certain conditions. But the flammability of the refrigerant is very low. It can be ignited only by fire.

Compared to common refrigerants, R32 is a nonpolluting refrigerant with no harm to the ozonosphere. The influence upon the greenhouse effect is also lower. R32 has got very good thermodynamic features which lead to a really high energy efficiency. The units therefore need less filling.

WARNING:

Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. Should repair be necessary, contact your nearest authorized Service Centre.

Any repairs carried out by unqualified personnel may be dangerous.

The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance or an operating electric heater).

Do not pierce or burn.

Appliance shall be installed, operated and stored in a room with a floor area larger than X m² (Please refer to table "a" in section of "SAFETY OPERATION OF FLAMMABLE REFRIGERANT" for Space X.)

Appliance filled with flammable gas R32. For repairs, strictly follow manufacturer's instructions only.

Be aware that refrigerants may not contain an odour.

i Read specialist's manual.

Operation and Maintenance

This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.

• Children shall not play with the appliance.
• Cleaning and user maintenance shall not be made by children without supervision.
• Do not connect air conditioner to multi-purpose socket. Otherwise, it may cause fire hazard.
• Do disconnect power supply when cleaning air conditioner. Otherwise, it may cause electric shock.
• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
• Do not wash the air conditioner with water to avoid electric shock.
• Do not spray water on indoor unit. It may cause electric shock or malfunction.
• After removing the filter, do not touch fins to avoid injury.
• Do not use fire or hair dryer to dry the filter to avoid deformation or fire hazard.
• Maintenance must be performed by qualified professionals. Otherwise, it may cause personal injury or damage.
• Do not repair air conditioner by yourself. It may cause electric shock or damage. Please contact dealer when you need to repair air conditioner.
• Do not extend fingers or objects into air inlet or air outlet. It may cause personal injury or damage.
• Do not block air outlet or air inlet. It may cause malfunction.
• Do not spill water on the remote controller, otherwise the remote controller may be broken.

When the following phenomena occur, please turn off air conditioner and disconnect power immediately, and then contact the dealer or qualified professionals for service:

• Power cord is overheating or damaged.
• There's abnormal sound during operation.
• Circuit break trips off frequently.
• Air conditioner gives off burning smell.
• Indoor unit is leaking.

If the air conditioner operates under abnormal conditions, it may cause malfunction, electric shock or fire hazard.

When turning on or turning off the unit by emergency operation switch, please press this switch with an insulating object other than metal.

Do not step on top panel of outdoor unit, or put heavy objects. It may cause damage or personal injury.

Installation

Attachment

Installation must be performed by qualified professionals. Otherwise, it may cause personal injury or damage.

• Must follow the electric safety regulations when installing the unit.
• According to the local safety regulations, use qualified power supply circuit and circuit break.
• Do install the circuit break. If not, it may cause malfunction.
• An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.
• Include an circuit break with suitable capacity. Air switch should be included magnet buckle and heating buckle function to protect against circuit-short and overload. (Caution: do not use the fuse only for protecting the circuit).
• Air Conditioner should be properly grounded. Incorrect grounding may cause electric shock.
• Don't use unqualified power cord.
• Make sure the power supply matches the requirement of the air conditioner. Unstable power supply or incorrect wiring may result in electric shock, fire hazard or malfunction. Please install proper power supply cables before using the air conditioner.
• Properly connect the live wire, neutral wire and grounding wire of the power socket.
• Be sure to cut off the power supply before proceeding any work related to electricity and safety.
• Do not put through the power before finishing installation.
• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
• The temperature of the refrigerant circuit will be high; please keep the interconnection cable away from the copper tube.
• The appliance shall be installed in accordance with national wiring regulations.
• Installation must be performed in accordance with the requirement of NEC and CEC by authorized personnel only.

The air conditioner is a first-class electric appliance. It must be properly grounded with a specialized grounding device by a professional. Please make sure it is always grounded effectively, otherwise it may cause electric shock.

The yellow-green wire in the air conditioner is the grounding wire, which cannot be used for other purposes.

The grounding resistance should comply with national electric safety regulations.

The appliance must be positioned so that the plug is accessible.

All wires of the indoor unit and outdoor unit should be connected by a professional.

If the length of the power connection wire is insufficient, please contact the supplier for a new one. Avoid extending the wire by yourself.

For the air conditioner with a plug, the plug should be reachable after finishing installation.

For the air conditioner without a plug, a circuit break must be installed in the line.

If you need to relocate the air conditioner to another place, only a qualified person can perform the work. Otherwise, it may cause personal injury or damage.

Select a location that is out of reach for children and far away from animals or plants. If it is unavoidable, please add a fence for safety purposes.

The indoor unit should be installed close to the wall.

Electrical Connections

GWHD(14)NK600, GWHD(18)NK600

1. Remove the handle at the right side plate of the outdoor unit (one screw).
2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the connection. The fitting line distributing must be consistent with the indoor unit terminal of the line bank. Wiring should meet that of the indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been fixed well.
5. Install the handle.

Air switch capacity:

Diagram Description: The diagram shows the outdoor unit and connections to indoor units A and B, and the power supply. Terminals are labeled N, L, 1, 2, 3. Power cord connects to the power supply. Indoor Unit A and B connect to the outdoor unit via cables. Wire colors are indicated: blue, black, brown, yellow-green.

An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.

Wrong wire connection may cause malfunction of some electric components. After fixing the cable, ensure that leads between connection points have some space.

The connection pipes and connection wirings of unit A and unit B must correspond to each other.

The appliance shall be installed in accordance with national wiring regulations.

GWHD(21)NK600, GWHD(24)NK600

1. Remove the handle at the right side plate of the outdoor unit (one screw).
2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the connection. The fitting line distributing must be consistent with the indoor unit terminal of the line bank. Wiring should meet that of the indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been fixed well.
5. Install the handle.

Air switch capacity:

Diagram Description: The diagram shows the outdoor unit and connections to indoor units A, B, and C, and the power supply. Terminals are labeled N, L, 1, 2, 3. Power cord connects to the power supply. Indoor Units A, B, and C connect to the outdoor unit via cables. Wire colors are indicated: blue, black, brown, yellow-green.

An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.

Wrong wire connection may cause malfunction of some electric components. After fixing the cable, ensure that leads between connection points have some space.

The connection pipes and connection wirings of unit A, unit B, and unit C must correspond to each other.

The appliance shall be installed in accordance with national wiring regulations.

GWHD(28)NK600, GWHD(36)NK600

1. Remove the handle at the right side plate of the outdoor unit (one screw).
2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the connection. The fitting line distributing must be consistent with the indoor unit terminal of the line bank. Wiring should meet that of the indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been fixed well.
5. Install the handle.

Air switch capacity:

Diagram Description: The diagram shows the outdoor unit and connections to indoor units A, B, C, and D, and the power supply. Terminals are labeled N, L, 1, 2, 3. Power cord connects to the power supply. Indoor Units A, B, C, and D connect to the outdoor unit via cables. Wire colors are indicated: blue, black, brown, yellow-green.

An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.

Wrong wire connection may cause malfunction of some electric components. After fixing the cable, ensure that leads between connection points have some space.

The connection pipes and connection wirings of unit A, unit B, unit C, and unit D must correspond to each other.

The appliance shall be installed in accordance with national wiring regulations.

GWHD(42)NK600

1. Remove the handle at the right side plate of the outdoor unit (one screw).
2. Remove the cable clamp, connect the power connection cable with the terminal at the row of connection and fix the connection. The fitting line distributing must be consistent with the indoor unit terminal of the line bank. Wiring should meet that of the indoor unit.
3. Fix power connection wire by wire clamp.
4. Ensure wire has been fixed well.
5. Install the handle.

Air switch capacity:

Diagram Description: The diagram shows the outdoor unit and connections to indoor units A, B, C, D, and E, and the power supply. Terminals are labeled N, L, 1, 2, 3. Power cord connects to the power supply. Indoor Units A, B, C, D, and E connect to the outdoor unit via cables. Wire colors are indicated: blue, black, brown, yellow-green.

An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.

Wrong wire connection may cause malfunction of some electric components. After fixing the cable, ensure that leads between connection points have some space.

The connection pipes and connection wirings of unit A, unit B, unit C, unit D, and unit E must correspond to each other.

The appliance shall be installed in accordance with national wiring regulations.

Installing the Outdoor Unit

Location

Use bolts to secure the unit to a flat, solid floor. When mounting the unit on a wall or the roof, make sure the support is firmly secured so that it cannot move in the event of intense vibrations or a strong wind.

Do not install the outdoor unit in pits or air vents.

Installing the Pipes

Use suitable connecting pipes and equipment for the refrigerant R32.

The sum of the capacity codes of the indoor units should be between 50%-150% of that of the outdoor unit.

The refrigerant pipes must not exceed the maximum heights of 15m (for 14~28K models) or 25m (for 36~42K models).

Wrap all refrigerant pipes and joints.

Tighten the connections using two wrenches working in opposite directions.

Caution: Installation Must be Performed in Accordance with the NEC/CEC by Authorized Personnel Only.

Install the drain fitting and the drain hose (for models with heat pump only)

Condensation is produced and flows from the outdoor unit when the appliance is operating in heating mode. To avoid disturbing neighbors and to respect the environment, install a drain fitting and a drain hose to channel the condensate water. Install the drain fitting and rubber washer on the outdoor unit chassis and connect a drain hose to it as shown in the figure.

NOTE: As for the shape of the drainage joint, please refer to the current product. Do not install the drainage joint in severe cold areas. Otherwise, it will be frosted and then cause malfunction.

Bleeding

Humid air left inside the refrigerant circuit can cause compressor malfunction. After connecting the indoor and outdoor units, bleed the air and humidity from the refrigerant circuit using a vacuum pump.

1. Unscrew and remove the caps from the 2-way and 3-way valves.
2. Unscrew and remove the cap from the service valve.
3. Connect the vacuum pump hose to the service valve.
4. Operate the vacuum pump for 10-15 minutes until an absolute vacuum of 10 mm Hg has been reached.
5. With the vacuum pump still in operation, close the low-pressure knob on the vacuum pump coupling. Stop the vacuum pump.
6. Open the 2-way valve by 1/4 turn and then close it after 10 seconds. Check all joints for leaks using liquid soap or an electronic leak device.
7. Turn the body of the 2-way and 3-way valves. Disconnect the vacuum pump hose.
8. Replace and tighten all the caps on the valves.

Diagram Description: The diagram illustrates the bleeding process, showing the connection of a vacuum pump to the service valve of the 2-way and 3-way valves on the indoor unit. It also shows the direction of refrigerant flow and the location of valve caps and securing points.

Maintenance

Use suitable instruments for the refrigerant R32.

Do not use any other refrigerant than R32.

Do not use mineral oils to clean the unit.

Installation Dimension Diagram

The installation must be done by trained and qualified service personnel with reliability according to this manual.

Contact service center before installation to avoid malfunction due to unprofessional installation.

When picking up and moving the units, you must be guided by trained and qualified personnel.

Ensure that the recommended space is left around the appliance.

Diagram Description: The diagram shows the outdoor unit with recommended clearances: 30cm or above space to the cover (from air inlet side), 200cm or above space on the air outlet side, 50cm or more space to the cover, 30cm or above space to the wall (from air inlet side), and 50cm or above space to the wall.

Fix the support of outdoor unit (select it according to the actual installation situation)

1. Select installation location according to the house structure.
2. Fix the support of outdoor unit on the selected location with expansion screws.

NOTICE:

• Take sufficient protective measures when installing the outdoor unit.
• Make sure the support can withstand at least four times of the unit weight.
• The outdoor unit should be installed at least 3cm above the floor in order to install the drain joint. (For models with a heating tube, the installation height should be no less than 20cm.)
• For units with cooling capacity of 2300W ~ 5000W, 6 expansion screws are needed; for units with cooling capacity of 6000W ~ 8000W, 8 expansion screws are needed; for units with cooling capacity of 10000W ~ 16000W, 10 expansion screws are needed.
• As for the shape of the drainage joint, please refer to the current product. Do not install the drainage joint in severe cold areas. Otherwise, it will be frosted and then cause malfunction.

Check After Installation

Safety Operation of Flammable Refrigerant

Qualification Requirement for Installation and Maintenance Man

All personnel engaging in the refrigeration system should bear valid certification awarded by the authoritative organization and the qualification for dealing with the refrigeration system recognized by this industry. If other technicians are needed for maintenance and repair, they should be supervised by a person qualified to use flammable refrigerant. Repairs can only be performed using methods suggested by the equipment manufacturer.

Installation Notes

• The air conditioner is not allowed to be used in a room with open flames (such as fire sources, working coal gas appliances, operating heaters).
• It is not allowed to drill holes or burn the connection pipe.
• The air conditioner must be installed in a room larger than the minimum room area specified on the nameplate or in Table a.
• Leak test is mandatory after installation.

Table a - Minimum Room Area (m²)

Maintenance Notes

• Check if the maintenance area or room area meets the nameplate requirements. Operation is only allowed in rooms meeting these requirements.
• Check if the maintenance area is well-ventilated. Continuous ventilation status should be maintained during operation.
• Check for fire sources or potential fire sources in the maintenance area. Naked flames are prohibited, and a "no smoking" warning board should be displayed.
• Check if the appliance markings are in good condition. Replace vague or damaged warning marks.

Welding

If you need to cut or weld refrigerant system pipes during maintenance, follow these steps:

1. Shut down the unit and cut power supply.
2. Eliminate the refrigerant.
3. Vacuuming.
4. Clean with N2 gas.
5. Cutting or welding.
6. Carry back to the service spot for welding.

The refrigerant should be recycled into the specialized storage tank.

Make sure there is no naked flame near the outlet of the vacuum pump and that the area is well-ventilated.

Filling the Refrigerant

• Use refrigerant filling appliances specialized for R32. Ensure different kinds of refrigerant do not contaminate each other.
• The refrigerant tank should be kept upright when filling.
• Stick the label on the system after filling is finished (or not finished).
• Do not overfill.
• After filling, perform a leakage detection before test running. Another leak detection should be done when it is removed.

Safety Instructions for Transportation and Storage

• Please use a flammable gas detector to check before unloading and opening the container.
• No fire source and smoking.
• Comply with local rules and laws.

Specialist's Manual

The following checks shall be applied to installations using flammable refrigerants:

• The charge size is in accordance with the room size within which the refrigerant containing parts are installed.
• The ventilation machinery and outlets are operating adequately and are not obstructed.
• If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant.
• Markings on the equipment continue to be visible and legible. Illegible markings and signs shall be corrected.
• Refrigeration pipes or components are installed in a position where they are unlikely to be exposed to any substance which may corrode refrigerant containing components, unless the components are constructed of materials inherently resistant to corrosion or are suitably protected.

Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used. This shall be reported to the owner of the equipment so all parties are advised.

Initial Safety Checks:

• Capacitors are discharged: this shall be done in a safe manner to avoid the possibility of sparking.
• No live electrical components and wiring are exposed while charging, recovering, or purging the system.
• There is continuity of earth bonding.

Checking for Presence of Refrigerant:

The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially toxic or flammable atmospheres. Ensure that the leak detection equipment being used is suitable for all applicable refrigerants, i.e. non-sparking, adequately sealed, or intrinsically safe.

Presence of Fire Extinguisher:

If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment shall be available. Have a dry powder or CO2 fire extinguisher adjacent to the charging area.

Ventilated Area:

Ensure that the area is in the open or is adequately ventilated before breaking into the system or conducting any hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.

Leak Detection Methods:

Leak detection fluids are suitable for use with most refrigerants, but the use of detergents containing chlorine shall be avoided, as chlorine may react with the refrigerant and corrode the copper pipe-work.

Checks to the Refrigeration Equipment:

Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times, the manufacturer's maintenance and service guidelines shall be followed. If in doubt, consult the manufacturer's technical department for assistance.

Checks to Electrical Devices:

• Capacitors are discharged: this shall be done in a safe manner to avoid the possibility of sparking.
• No live electrical components and wiring are exposed while charging, recovering, or purging the system.

Repairs to Sealed Components:

During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.

Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.

• Ensure that the apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to the point that they no longer serve the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall be in accordance with the manufacturer's specifications.

NOTE: The use of silicon sealant can inhibit the effectiveness of some types of leak detection equipment. Intrinsically safe components do not have to be isolated prior to working on them.

Repair to Intrinsically Safe Components:

Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmosphere. The test apparatus shall be at the correct rating.

Replace components only with parts specified by the manufacturer. Other parts may result in the ignition of refrigerant in the atmosphere from a leak.

Cabling:

Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges, or any other adverse environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.

Detection of Flammable Refrigerants:

Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used.

Decommissioning:

Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of reclaimed refrigerant. It is essential that electrical power is available before the task is commenced.

1. Become familiar with the equipment and its operation.
2. Isolate system electrically.
3. Before attempting the procedure, ensure that:
• Mechanical handling equipment is available, if required, for handling refrigerant cylinders.
• All personal protective equipment is available and being used correctly.
• The recovery process is supervised at all times by a competent person.
• Recovery equipment and cylinders conform to the appropriate standards.
4. Pump down the refrigerant system, if possible.
5. If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
6. Make sure the cylinder is situated on the scales before recovery takes place.
7. Start the recovery machine and operate in accordance with manufacturer's instructions.
8. Do not overfill cylinders (no more than 80% volume liquid charge).
9. Do not exceed the maximum working pressure of the cylinder, even temporarily.
10. When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off.
11. Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.

Labelling:

Equipment shall be labelled stating that it has been decommissioned and emptied of refrigerant. The label shall be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.

Recovery:

When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely.

When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e., special cylinders for the recovery of refrigerant). Cylinders shall be complete with a pressure-relief valve and associated shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.

The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of all appropriate refrigerants, including, when applicable, flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained, and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult the manufacturer if in doubt.

The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders.

If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely.